Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Biotite from
Skunk Creek outcrops, Madison County, Montana, USA


Locality type:Outcrop
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Skunk Creek outcrops, Madison County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:922077
Long-form Identifier:1:3:922077:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
37.9km (23.5 miles) ⓘBeartrap corundum deposit, Madison County, Montana, USA
42.4km (26.4 miles) ⓘGilliam prospect, Madison County, Montana, USA
45.7km (28.4 miles) ⓘDillon Nickel Deposit (Wolf Creek Nickel Deposit), Ruby Mining District, Beaverhead County, Montana, USA
46.0km (28.6 miles) ⓘAlbitite, West Gallatin Mining District, Gallatin County, Montana, USA
51.9km (32.3 miles) ⓘCamp Creek Corundum Occurrence, Beaverhead County, Montana, USA
53.2km (33.0 miles) ⓘGallatin Corundum deposit, Gallatin Gateway, Gallatin County, Montana, USA
54.2km (33.7 miles) ⓘElk Creek corundum deposit (Montana Mine; Gallatin deposit; Flying D), Gallatin County, Montana, USA
60.7km (37.7 miles) ⓘBozeman Corundum Mine, Gallatin Gateway, Gallatin County, Montana, USA
62.9km (39.1 miles) ⓘGolden Sunlight Mine, Whitehall Mining District (Cardwell Mining District), Jefferson County, Montana, USA
63.3km (39.3 miles) ⓘMica Creek Deposit (Mica Mine), Gallatin Range, Gallatin County, Montana, USA
References
Burger, H.R. et. al. (2004) Geology and geochemistry of the Spuhler Peak metamorphic suite: in Precambrian Geology of the Tobacco Root Mountains, Montana: Geological Society of America Special Paper 377: 47-70
 
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